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| LTC3851-1_15 Datasheet, PDF (5/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3851-1
Efï¬ciency and Power Loss
vs Input Voltage
100
EFFICIENCY,
95
IOUT = 5A
90
POWER LOSS,
IOUT = 5A
10000
Load Step
(Burst Mode Operation)
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
85
80 POWER LOSS,
IOUT = 0.5A
75
70
4 8 12 16
EFFICIENCY,
IOUT = 0.5A
1000
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
100
20 24 28 32
INPUT VOLTAGE (V)
38511 G04
VOUT
100mV/DIV
AC-COUPLED
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
Load Step
(Forced Continuous Mode)
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
VOUT
100mV/DIV
AC-COUPLED
38511 G05
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
38511 G06
Load Step
(Pulse skip Mode)
Inductor Current at Light Load
Start-Up with Prebiased Output
at 2V
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
VOUT
100mV/DIV
AC-COUPLED
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
FORCED
CONTINOUS
MODE
5A/DIV
Burst Mode
OPERATION
5A/DIV
3851 G07
PULSE SKIP
MODE
5A/DIV
VOUT = 1.5V
1μs/DIV
VIN = 12V
ILOAD = 1mA
FIGURE 11 CIRCUIT
VOUT
2V/DIV
VFB
0.5V/DIV
38511 G08
TK/SS
0.5V/DIV
20ms/DIV
38511 G09
Coincident Tracking with Master
Supply
VMASTER
0.5V/DIV
VOUT
2A LOAD
0.5V/DIV
10ms/DIV
38511 G10
Ratiometric Tracking with Master
Supply
VMASTER
0.5V/DIV
VOUT
2A LOAD
0.5V/DIV
10ms/DIV
38511 G11
Input DC Supply Current
vs Input Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
4 8 12 16 20 24 28 32 36 40
INPUT VOLTAGE (V)
38511 G12
38511fa
5
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